赣南桃江河表层沉积物钨赋存特征及风险分析

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Abstract

Total concentrations and forms of tungsten in surface sediments from Taojiang river were determined and the methods of enrichment coefficient (EF) and risk index coding (RAC) were applied to assess the accumulative degree and environmental risks. The results showed that the tungsten concentrations ranged from 1.21 to 39.73mg/kg, with an average of 18.21mg/kg, while 58% of sampling sites were greater than the background values of the soil in Jiangxi Province. The species of tungsten were presented dominantly in the residual fraction, followed by the oxidizable, reducible and weak acid extraction fraction. Spatially, the effective tungsten in tributary is maximal with a mean value of 22.44%, followed by downstream (21.03%), upstream (14.45%) and midstream (10.91%). Correlation analysis showed that total concentrations and species of tungsten were positively correlated with the pH and cation exchange, respectively. The EF analysis suggested that the tungsten enrichment was seriously accumulated in the upper reaches and tributaries of the Taojiang River. The RAC analysis demonstrated the ecological risk in different sampling sites was low, medium and high, with a proportion of 33.33%, 46.67% and 17.78%, respectively. Altogether, this study indicated that the tungsten were accumulated in sediments of Taojiang River with seriously environmental risks, which deserve to be additional more extensive researches.

Key words： Taojiang River sediment tumgsten occurrence form risk assessment

Received: 10 September 2018

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X142

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	CHEN Ming
	LI Feng-guo
	SHI Yan-li
	TAO Mei-xia
	HU Lan-wen

Cite this article:

CHEN Ming,LI Feng-guo,SHI Yan-li等. Occurrence characteristics and risk assessment of tungsten in surface sediments of Taojiang River in Southern Jiangxi Province[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(4): 1715-1723.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I4/1715

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